Bumps wireguard-go pin to include the roaming endpoints fix, and two internal enhancements. Pulls stock wireguard-go for non-tailscale simulation in tests, to use its endpoint discovery mechanism. Updates #20082 Change-Id: I2ff282cb7fe4ab099ce5e780a1d40ae86a6a6964 Signed-off-by: Alex Valiushko <alexvaliushko@tailscale.com>